Nine children vanish inside the mysterious Twelve Houses Society, and young detective Ethan Potts is assigned the case. But the moment he enters, strange things begin-CCTV cameras fail, residents lie, and a masked man in a brown coat silently watches him. With his intern Vishnu, Ethan uncovers hidden basements, burning houses, and a ritual that demands thirteen sacrifices. The killer is always one step ahead... and he wants Vishnu next. Now trapped inside the society, Ethan must stop the masked man before the final strike-because tonight, the ritual ends in bloood.